Marvel has settled a long-running rights battle with the heirs of Jack Kirby. Kirby worked with Stan Lee in the 1960s to develop many of the iconic characters of the Marvel universe, including Iron Man, Hulk, Thor, the Fantastic Four, and others. Over the years Kirby’s heirs and Marvel have each sued each other over the creator credit and the Supreme Court was considering whether they should take up the case when the settlement was reached for an undisclosed amount and for undisclosed terms.